ATR Info Siemens CardOS 4.3B | ATR Infos Safenet Model 330

ATR Infos Starcos SPK 2.3

		STUDY

The ATR of the G&D Starcos SPK 2.3 is: 3b b7 94 00 81 31 fe 65 53 50 4b 32 33 90 00 d1

G&D Starcos SPK 2.3

ATR: 3b b7 94 00 81 31 fe 65 53 50 4b 32 33 9000d1

ATR Bytes	Parameter
TS=0x3b (direct)	f(min)=1000kHz (default)
T0=0xb7 (Y(1)=11,K=7)	f(max)=5000kHz
TA(1)=0x94 (FI=9,DI=4)	Fi=512
TB(1)=0x00 (II=0,PI1=0)	Di=8
TD(1)=0x81 (Y(2)=8,T=1)	N=0 (default)
TD(2)=0x31 (Y(3)=3,T=1)	P=0dV
TA(3)=0xfe (IFSC=254)	I=25mA
TB(3)=0x65 (BWI=6,CWI=5)	X=Not supported (default)
T1=0x53 'S'	U=A only (default)
T2=0x50 'P'	IFSC=254
T3=0x4b 'K'	BWI=6
T4=0x32 '2'	CWI=5
T5=0x33 '3'	EDC=LRC
T6=0x90	T(supp)=1
T7=0x00
TCK=0xd1

Meaning of the Parameter

As seen above, the single bytes of the ATR indicate certain values.

f(min): minimum frequency for communication with the card
f(max): maximum frequency, for communication with the card
Fi: Clock rate conversion factor.
Di: Baude rate adjustment factor.
N: Extra guardtime
P: programming voltage
I: programming power
X: Clock stop indicator
U: Class indicator for operating condition. class A = 5V, class B = 3V
IFSC: Maximum information field size for cards; maximum length of blocks, the card can receive
BWI: Block waiting time integer. The maximum delay between rising (front) edge of the last character in a block to the rising (front) edge of the next block.
CWI: Character waiting time integer. The maximum delay between the rising (front) edges of to consecutive characters within a block.EDC: Error detection code. Gibt die Art der Error Detection (LRC, CRC) an.T: Protokoll Typ.

Conclusion

The performance results of a card reader depends strongly on the used smart card. To compute the etu (elementary time unit), the time length for transmittance of one bit, you need the frequency and the conversion and the adjustment factor. The formula is

1 etu = (F/D) * (1/f)

F = Clock rate conversion factor
D= Baud rate adjustment factor
f = Frequency (Hz)

Concretely the Starcos SPK 2.3 card results in an etu about ap. 12ms (Fi = 512, Di = 8, f = 5 MHz). For the user more interesting is the baudrate of the communication with the card. You can compute it with:

Baudrate = (f/F) * D

The Starcos SPK 2.3 has a maximum baudrate of 78125. This value is accepted by the card. Crucial is the frequency of the card reader - resulting in other baudrates. Due to this facts it is possible, that a card reader can communicate very fast with one card, while another card seems to be extremely slow. You can see this perception in your Reader Test.